<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="js/vue.js"></script>
</head>
<body>
    <div id="app">
        {{fullName}}{{age}}
    </div>

    <script>
        var vm = new Vue({
            el: "#app",
            data: {
                firstName: "zhang",
                lastName: "jiaxuan",
                fullName: "zhangjiaxuan",
                age: 28
            },
            // 计算属性(内置缓存)
            computed: {
                fullName: function () {
                    console.log("计算了一次");
                    return this.firstName + " " + this.lastName;
                }
            }
            // 方法
            // methods: {
            //     fullName: function () {
            //         console.log("计算了一次");
            //         return this.firstName + " " + this.lastName;
            //     }
            // }
            // 监听器
            // watch: {
            //     firstName: function () {
            //         console.log("计算了一次");
            //         this.fullName = this.firstName + " " + this.lastName;
            //     },
            //     lastName: function () {
            //         console.log("计算了一次");
            //         this.fullName = this.firstName + " " + this.lastName;
            //     }
            // }
        })
    </script>
</body>
</html>